Blade-adjusting mechanism for cutter heads



June 112, 1923.

C. L. SAVIEO BLADE ADJUSTING MECHANISM FOR CUTTER HEADS Fi led April 21, 1921 2 Sheets-Sheet 1 IN VEN TOR A TTORNE Y Jum 12, 1923.

C. L. SAVIEO BLAPE ADJUSTING MECHANISM FOR CUTTER HEADS Filed April 21 1921 2 SheetsSheet 2 IN VEN TOR A TTORNE Y CHARLES L. SAVIEO, OF LIMA, OHIO, ASSIGNOR TO WALTER H FOS'IER,

rate

OF NEW YORK, n. Y.

BLADE-ADJUSTING MECHANISM FOR'GUTTER HEADS.

Application filed April 21, 1921. Serial No. 463,293.

T all to ham it may concern:

Be it known that I, CHARLES L. SAvIEo, a citizen of the United States, residing in Lima, Ohio, have invented certain new and useful Improvements in a Blade-Adjusting Mechanism for Cutter Heads, of which the following is a specification.

1 My invention relates to cutter heads and similar apparatus used for turning bolt blanks and the like. In such cutter heads the cutting edges of the blades may wear more at oneend than at the other so that an angular adjustment is necessary to restore the original cutting line. Also for turning a taper on a blank the edges of the cutting blades have to be set angularly to the axis of rotation. My invention provides improved means for varying the angularity of blades for either of these purposes.

The accompanying "drawings embodiments of the invention.

Fig. 1 is a plan and Fig. 2 is a cross-sec tion on the line 2-2 of Fig. 1 showing a cutter head with adjustable blades;

Fig. 3 is a horizontal section taken approximately on the line 3-3 of Fig. 2, illustrating a detail;

Figdis a horizontal section on the line 4;4- of Fig.1;

Fig. 5 is adiametral section of another style of cutter head; Y

F'ig. -6is a section similar to Fig. 2 of a modified construction.

Referring to the embodiment of the invention illustrated, the cutter head comprises an outer ring 1 which is fastened in the machine and carries cutting blades 2 and centering blades 3. The head is closed at one end, except for a central opening for the passage of the work, by means of an e nd plate 4:, and the blades are held in position by means of spacing blocks 5 of approximately triangular shape fastened on the end plate by means of screws 6 having heads depressed in sockets 7 of the spacers. Each of these illustrate fastening screws has a ring or shoulder 8 and each blade has a transverse groove9 engagin the ring 8 and by which the blade is held own against movement in an axial direction but is free to be adjusted radially. Each blade may be adjusted inward bv means of a cam 10 bearing on the oblique outer edge of the blade and moved up or down by engagement with a shoulder or ring 11 on a screw 12 which is threaded into an opening in the outer ring 1 of the head. The apparatus thus far described is of a common construction. My improvement is applicable to this type of cutter heads and to various other types and to cutter heads used in'various types of turning machines both horizontal and vertical.

The groove 9 on the blade engages the shoulder 8 of the screw with sufficient play to permit angular adjustment of the blade. On the underside of the end plate 4c there are a number of blocks 13 each fastened in place y pair of grooves 15 and 16 extending across its upper face and forming sockets for rockers 17 and 18 placed in the manner shown in Figs. 3 and l. Each rocker hasa projection 19 on its lower edge which is rounded and fits into a corresponding depression in the blockor holder 13. These two rockers are so placed that their projecting-ends extend under the blades, one rocker of each pair. being located near the outer edge of the blade and the other rocker near the inner edge. The movement'of the free ends of the rockers is transmitted upward to the blades through pins 20 and 21 resting on the rockers and passing freely through openings in the end plate 4 of the head. On the inner ends of the blades bear pins 22 and 23 which pass up through the end plate and through the spacing block 5 .and into sockets 24: which are formed in the upper portions of said spacers and which are threaded to receive screws 25 and 26 exposed at the upper end of the cutter head or accessible therefrom. When the screws 25 and 26 are screwed down in the axial direction their movement is transmitted in an upward direction to the corresponding blade. When the angle of the blade is to be changed the screw 26 will be withdrawn and the screw 25 correspondingly advanced or vice versa, thus tilting the blade to throw the upper end of its cutting edge inward or outward as the case may require.

The means for transmitting the movement of the adjusting screws or equivalent devices to the blades may be considerably varied. Fig. 5, for example, shows a design which is preferable for-cutter heads carrying very long blades. The blades 27 in this case are carried within a long ring 28, with an end plate 29 and are adjusted inward by means of a pair of wedges 30 and 31 having means of a screw l i'and each having a "ting devices therefrom will the blades by adjusting means actin transversely near the oppos'iteends of the blades. The adjusting screw 34 is, therefore, provided, screwing into a socketin the end of the ring and bearing on a rod 35- passing freely through theuringto apoint Where its beveled. lower end engages the beveled outer end of a pin 36 moving. freely in a transverse dlrection and having its :lnnerend bear ng against the lower part ofthewedgle 81'; so that whenthe screw 34: is advanced the lower end of the blade is thrown in" ward. A similar screw 37 also accessible the upper end of the ring bears on a "verticalrod, 38 with a beveled lowerend which ,iforces inward the transverse pin .39 bearing. against the upper part of the wedge '31; so that when the screw 37 is advanced theupper end of the-blade will be g forced inward.

A pair of adjusting sc'reWsJand transmitbe applied to each of the blades, .or to the vcuttingblades alone as circumstances may require. The

same'is true of the design shown in Figs. 1

and 2, although :in the latter case the adjustment is shown'for the centering blades as well as for the cutters. In the design of Fig. 6 the radial adjust- I ment is eifected without the interposition of .aseparate wedg, such as 10,.Fig. 2, at the backfof the blade. For this purpose the rear edge 40 of the blade 2 lSmZLClBTObllqUG and extended to a'poin-t below the rounded end of'the adjusting-screw 41, a slot 42 be :ingit'ormed in-the rin'gl toreceive the end of the blade.

' The blade being uno'l-amped may be adjusted inward byscrewi-ng down the screw 41. This scheme simplifiesthe til-ting operation can take place easily above the contact of the adjusting screw, 41 with the edge 40 Without varying the character of engagement of the parts at this point;

Though I have-describedwith gr atpa w ticul-arity of detail certain specific embodiments of my inventionyet itiis not to. be understood therefrom that the invention is restricted to the particular.embodiments dis closed. Various modifications thereof in detail and in .the arrangement of the parts may be made. .by those skilled in the art without departure from the invention as-defined in the follow-ing claims.

:VVhatI claimis 1. A cutter headcarrying blades, means for varying the singularity-01f the blades and additional means for adjusting the blades -radially.y i v qj g i :2. A*cutter-head carryingbladesj, means for varying; the ,angularity of the blades and an additional adjusting screw bearing on the oblique rear-endof each blade-for adjusting it radially. I 1

3. A cutter head carrying blades withoblique rear edges and haa'i ngadjustin'gscrews I bearing on such edges so ;as =t o perm tv a tilting movement of; the blades, in combination with means ar tilting the blades v .4. A cutter head carrying. bladesahaving oblique rear edges and verticaliscrews;bearing directly on suohfledges gand jserving to adjust the blades radially and-to permit a tilting movement thereo hiin combination with means for tilting the blades.

In witness-whereof, I have ,hereunto signed my name. v Y

CHARLES. L. S van. I 

